Here is the situation. According to Jesus, we must be willing to give up anything for him. If I hold that the Catholic Church is the true church, and my wife does not, where does that leave us? According to you, I can order her to leave her faith for mine. However, in doing that, she would feel like she was willing to give up Jesus for me, which is NOT allowed. The inverse is also true.
How do you fix that?
It does not matter how you see denominations. The reality of the situation is that there is deep division with in the Church. These divisions were made by men who chose their own ways instead of God’s. Everyone cannot be correct. I have chosen to be Catholic for many, many reasons. In choosing to be Catholic, I am called to accept that which the Catholic CHurch says as being true. Now, unless you can give PROOF that I am wrong and not just assertions based on a slanted veiw of scipture, I am allowed to accept the Catholic Church as being correct.
Jesus called marriage one man and one woman united with God. THat is enough. TO be of different faith traditions makes it harder to remain married. The Catholic Church knows this, and discourages mixed marriages. That verse that you have quoted comes from a time when you were either CAtholic or you did not accept Christ at all. There were no denominations in Paul’s time.